Method of manufacturing a steel end plate for a frameless blancher for food

ABSTRACT

A method of manufacturing a steel end plate for a food blancher having a tank, which plate has a main portion for being welded to the tank end and an integral leg portion with a lower edge and extending from the main portion. The method provides a steel sheet and automatically cuts out from the steel sheet, the main portion and the integral leg portion. The end plate has opposite side edges and also has holes in said end portion that are substantially located and cut automatically by a CNC laser machine.

CROSS REFERENCE TO A RELATED APPLICATION

[0001] This application is a divisional application of U.S. Ser. No. 09/705,017 filed Nov. 2, 2000.

FIELD OF THE INVENTION

[0002] This invention relates to apparatus for processing food in general and in particular to apparatus for heating food products within a water bath.

BACKGROUND OF THE INVENTION

[0003] In the apparatus of the type to which the present invention pertains, it is necessary to produce a blancher at a minimum cost and of simplified design.

[0004] Prior art blanchers utilize a separate frame for supporting the tank of the blancher which may include a framework welded together and including legs in the frame for supporting the main portion of the blancher. Such blanchers are shown in U.S. Pat. No. 5,429,041, issued Jul. 4, 1995 to Zittel; U.S. Pat. No. 5,592,869, issued Jan. 14, 1997 to Zittel; U.S. Pat. No. 5,133,249, issued Jul. 28, 1992 to Zittel; and U.S. Pat. No. 4,942,810, issued Jul. 24, 1990 to Zittel and Robbins et al.

[0005] The prior art including the above patents utilize a separate framework which is welded together and then the tank itself is assembled into this framework. This separate frame construction results in considerable cost.

SUMMARY OF THE INVENTION

[0006] The blancher of the present invention provides a frameless design, that is, having no separate frame structure. The lack of a separate frame structure is possible by the use of end plates for the tank, which plates have integrally formed legs. These end plates for the tank are preferably cut on a CNC (Computer Numerical Control) laser machine which locates all of the holes in the end plate precisely and which permits subsequent robotic welding of attached tubes, as will appear. These end plates are welded to each end of the lower tank portion. The end plates with the integral legs are fabricated to form the particularly rigid and strong structure.

[0007] The invention provides a method of making a particularly rigid structure which includes the U-shape tank having an end plate with integral legs welded to each end of the tank and also having a pair of main tubes extending between the two end plates and rigidly secured thereto as by welding. The upper opposite edges of the tank are formed in a particularly rigid manner by means of being fabricated to form a water seal for the cover. These two rigid upper edges of the tank, together with the two main tubes and the end plates with integral legs, all form a particularly rigid and economically produced structure. In addition, they permit easy assembly, handling, strength, and the ability to accommodate thermal stresses.

[0008] There is provided a method of manufacturing a steel end plate for a food blancher. The CNC laser machine is used with the present manufacturing process and is of itself a conventional but improved design. This machine is engineered to maximize beam intensity and provides a constant length pivoting beam, which minimizes beam divergence. Vibration has been reduced using computer-aided engineering. These machines are of the CO₂ gas laser type having a wavelength of 10.6 micron non-visible light. If other characteristics of this laser machine are deemed to be either necessary or desirable, reference may be had to the Mazak Nissho Iwai Company located in Schaumburg, Ill. 60173.

[0009] These and other objects and advantages of the present invention will appear hereinafter as this disclosure progresses.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]FIG. 1 is a general perspective view of the frameless blancher of the present invention and shown in the assembled position.

[0011]FIG. 2 is an enlarged, fragmentary view of the front end portion of the blancher shown in FIG. 1 but also showing the cover in the raised position.

[0012]FIG. 3 is a transverse sectional view through the blancher and on a slightly enlarged scale.

[0013]FIG. 4 is an enlarged, fragmentary view of the water seal between the cover and the tank, the view being an enlargement of the corresponding portion shown in FIG. 3.

[0014]FIG. 5 is a perspective, view of the tank with the end plates welded thereto and also showing the rotary support drums located generally centrally of the length of the tank.

[0015]FIG. 6 is a perspective, exploded view of the tank, the end plates with integral legs, and two main tubes extending between the end plates and welded thereto.

[0016]FIG. 7 is a fragmentary cross-sectional view through the end plate and a main tube welded thereto.

[0017]FIG. 8 is an enlarged detail of the rigid upper edge of the tank, which is formed along each upper edge of the tank and which, together with the main tubes, the tank, and the end plates with integral legs, form a particularly rigid structure.

DESCRIPTION OF A PREFERRED EMBODIMENT

[0018] Referring to FIG. 1, the general organization of the improved blancher includes the generally U-shaped in cross-section tank 10, the cover 11 extending co-extensively with the tank 10, two end plates 12 and 13 with integral legs. As shown in FIG. 2, the cover 11 can be raised and thus separated from the tank by means of the hydraulic or electric cylinders 16 located at each corner of the blancher and connected between the end plates 12 and 13.

[0019] Plates 12 and 13 are similarly formed and have a main portion 17 (FIG. 3) and a lower leg portion 18.

[0020] The end plates 12 and 13 with integral legs are fabricated from heavy sheet steel of a thickness, for example, ⅜ of an inch.

[0021] As shown clearly in FIG. 2, the end plates 12 and 13 have a series of precisely located holes formed therein by being cut on a CNC laser machine simultaneously with the cutting of the end plate itself. These end plates are the main structural support for the blancher and result in considerable material saving and labor due to the lack of framework material being otherwise required as in conventional blanchers. The holes in the end plate include those previously mentioned for the two tubes 14 and 15, welded therein. The tubes 14 and 15 are also utilized by acting as conduits or enclosures for running air or hydraulic lines, etc., or other utility members.

[0022] As an example of the use of the other holes, hole 20 is for water discharge (as will appear), hole 21 is for steam, hole 22 is for a thermometer, hole 23 is for steam, holes 24 and 25 are for air discharge, with all of these holes being accurately and efficiently formed by a laser controlled numerical cutting device.

[0023] It will be noted that the end plates have outwardly turned flanges along their opposite vertical edge. The lower portion of the end plates 12 and 13 has, respectively, outwardly turned flanges 12A and 13A along the vertical sides. Flanges 12B and 13B are formed along the lower edges of plates 12 and 13, respectively. The flanges 12A and 12B are welded together at their corner intersection as shown in FIG. 3 and the end plate 13 at the opposite end of the blancher is similarly formed, resulting in end plates that are particularly strong and rigid.

[0024] Along the length of the upper edges of the tank, as shown clearly in FIGS. 3, 4, 6 and 8, are formed water seals between the cover 11 and the tank 10. More particularly, as shown clearly in FIG. 8, the upper edge of the tank 10 has an inwardly turned portion 28 that terminates in an upper end 28 a. A steel rigidifying member 26 extends along the upper edge of the length of each side of the tank. Member 26 is bent inwardly as at 27 and terminates in an upwardly facing trough 29 of which terminates in an upper free end 30. The lower edge 31 of member 26 is welded at 32 along the length of the outside of the tank. The upper end of member 28 a is welded all along at 33 to the free end 30 of the trough 29.

[0025] This design requires only two lengths of welding on each side of the tank and is relatively easy to make because the joints are easily accessible.

[0026] The upper corner of the tank is thus formed as a generally triangular in cross section box B, is particularly rigid and resists twisting and bending of the tank. This construction also maintains the shape and straightness of the assembly during construction. Also, the trough is concealed within the blancher and shielded from contact by the operator.

[0027] This simplified water seal also results in a simplified cover design which is relatively light and inexpensive to manufacture.

[0028] Thus, along each upper edge of the tank a rigidifying structure is provided, which together with the tubes 14 and 15, the tank 10, end plates 12 and 13, forming the integral legs, create a strong and rigid structure without the necessity for additional framework.

[0029] As shown in FIGS. 3 and 4, to form the water seal along the entire length of the upper edges of the tank, the cover 11 has an inwardly turned portion 34 along its length, at each side. This portion 34 terminates in a downwardly turned portion 35 that is located in the trough or channel 29 of the tank as shown in FIG. 4. Thus, the moisture water flows down the inner side of the cover 11 and into the trough 29 where it is drained out of the tank for example, through the end plate holes 20 (FIGS. 2 and 5).

[0030] A water seal is also formed between the end plates 12 and 13 of the tank and ends 11A of the cover 11 (FIG. 2). A flange 11B is formed by bending along the lower, inside edge of each end 11A of the cover and its lower edge is received in the trough 46 (FIGS. 2 and 5) that is welded along the inner side of the end plates 12 and 13. The end troughs 46 are in communication with the side troughs 29 at their corner points of juncture and are both then drained out of the previously mentioned holes 20.

[0031] Within the tank is located the conventional rotary apparatus 49 for moving the product from the inlet end 50 (FIG. 2) to the outlet end 52 (FIG. 3) in the known manner. This rotary food transporting apparatus is shown in the above mentioned patents and others, and which patents are incorporated here by reference. A further description of such food transporting apparatuses is deemed neither desirable nor necessary in the present application.

[0032] As shown in FIG. 5 conventional means are provided for supporting rotary drums of the food transporting apparatus as shown and described in U.S. Pat. No. 5,429,041 (FIG. 11). These two separate rotary drums are driven at each end of the blancher by a pulley 60 (FIGS. 1 and 2) which, in turn, is driven by the shaft 61 from the electric motor 62 (mounted on the platform 63) in the known manner. This driving arrangement is the same at each end of the blancher.

Recapitulation

[0033] As shown in FIG. 6, the present invention provides a particularly rigid basic structure for a food blancher and which includes the tank 10 having a rigidifying upper edge along either of its sides, formed by the water seal, the two end plates 12 and 13 with integral legs, the end plates being formed simultaneously with the necessary openings by means of CNC laser operation. The basic tank is furthermore rigidified and strengthened by the two elongated tubes 14 and 15 welded at each of their ends to the end plates. These tubes take significant stress off the tank.

[0034] The end plate of the tank is preferably cut on a CNC laser machine which also locates all of the holes precisely and which permits robotic welding of parts to be subsequently attached. This structure provides a material saving due to the lack of a frame material. The end plates are provided with integrally formed legs and the entire arrangement permits the elimination of a separate frame structure. 

What is claimed is:
 1. A method of manufacturing a steel end plate for a food blancher, said end plate having a main portion for being welded to a tank end and an integral leg portion with a lower edge and extending from said main portion, said method comprising providing a steel sheet and automatically cutting out from said steel sheet, said main portion and said integral leg portion to form said end plate having opposite side edges and also substantially simultaneously locating and cutting holes in said end portion, all said cutting being done automatically by a CNC laser machine.
 2. The method as claimed in claim 1 including bending outwardly turned flanges along said sides of said end plate, and bending outwardly turned flanges along said lower edge of said integral leg portion.
 3. A method of manufacturing a steel end plate for a food blancher, said end plate having a main portion for being welded to a tank end and an integral leg portion with a lower edge and extending from said main portion, said method comprising providing a steel sheet and automatically cutting out from said steel sheet, said main portion and said integral leg portion to form said end plate having opposite side edges, bending outwardly turned flanges along said side edges of said end plate, and bending outwardly turned flanges along said lower edge of said integral leg portion.
 4. The method set forth in claim 3 further characterized in that said cutting is done automatically by a CNC laser machine. 